using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data.SqlClient;
using System.Data;
using System.Collections;
using System.Windows.Forms;

namespace WindowsFormsApplication1.ItemClass
{
    public class SqlBaseClass
    {
        #region 代碼中用到的變量
        SqlDataAdapter adp;
        DataSet ds;
        SqlCommand cmd;
        SqlDataReader dr;
        string connectionString = "server=.;database=db_GoodsManageData;User ID=sa;Pwd=aa";
        SqlConnection conn;
        #endregion

        #region 鏈接數(shù)據(jù)庫(kù)
        /// <summary>
        /// 鏈接數(shù)據(jù)庫(kù)
        /// </summary>
        /// <returns></returns>
        public SqlConnection GetCon()
        {
            conn = new SqlConnection(connectionString);
            conn.Open();   //打開(kāi)鏈接
            return conn;   //返回鏈接字符串
        }
        #endregion

        #region 執(zhí)行SQL語(yǔ)句
        /// <summary>
        /// 執(zhí)行SQL語(yǔ)句
        /// </summary>
        /// <param name="cmdText">要執(zhí)行的SQL語(yǔ)句</param>
        /// <returns></returns>
        public bool GetExecute(string cmdText)
        {
            cmd = new SqlCommand(cmdText,GetCon());
            try
            {
                cmd.ExecuteNonQuery();
                return true;
            }
            catch (Exception ex)
            {
                MessageBox.Show("錯(cuò)誤：" + ex.Message, "錯(cuò)誤提示", MessageBoxButtons.OKCancel, MessageBoxIcon.Error);
                return false;
            }
            finally
            {
                if (GetCon().State == ConnectionState.Open)
                {
                    //如果數(shù)據(jù)庫(kù)鏈接處于打開(kāi)狀態(tài),，則關(guān)閉連接并釋放占用的資源
                    GetCon().Close();
                    GetCon().Dispose();
                }
            }
        }
        #endregion

        #region 返回?cái)?shù)據(jù)集
        /// <summary>
        /// 返回?cái)?shù)據(jù)集類型
        /// </summary>
        /// <param name="cmdText">要執(zhí)行的SQL語(yǔ)句</param>
        /// <returns></returns>
        public DataSet  GetDs(string cmdText)
        {
            try
            {
                adp = new SqlDataAdapter(cmdText,GetCon());
                ds = new DataSet();
                adp.Fill(ds);
                return ds;
            }
            catch (Exception ex)
            {
                MessageBox.Show("錯(cuò)誤：" + ex.Message, "錯(cuò)誤提示", MessageBoxButtons.OKCancel, MessageBoxIcon.Error);
                return null;
            }
            finally
            {
                if (GetCon().State == ConnectionState.Open)
                {
                    //如果數(shù)據(jù)庫(kù)鏈接處于打開(kāi)狀態(tài),，則關(guān)閉連接并釋放占用的資源
                    GetCon().Close();
                    GetCon().Dispose();
                }
            }
        }
        #endregion

        #region 返回SqlDataReader類型數(shù)據(jù)
        /// <summary>
        /// 返回SqlDataReader類型數(shù)據(jù)
        /// </summary>
        /// <param name="cmdText">要執(zhí)行的SQL語(yǔ)句</param>
        /// <returns></returns>
        public SqlDataReader  GetReader(string cmdText)
        {
            cmd = new SqlCommand(cmdText ,GetCon());
            try
            {
                dr = cmd.ExecuteReader();
                return dr;
            }
            catch (Exception ex)
            {
                MessageBox.Show("錯(cuò)誤：" + ex.Message, "錯(cuò)誤提示", MessageBoxButtons.OKCancel, MessageBoxIcon.Error);
                return null ;
            }
            finally
            {
                if (GetCon().State == ConnectionState.Open)
                {
                    //如果數(shù)據(jù)庫(kù)鏈接處于打開(kāi)狀態(tài),，則關(guān)閉連接并釋放占用的資源
                    GetCon().Close();
                    GetCon().Dispose();
                }
            }
        }
        #endregion
    }
}